... Derivation. View Answer. Consider two thin convex lenses L 1 and L 2 of focal length f 1 and F 2 placed coaxially in contact with each other. Before understanding the formula, let us look at some terminology you need to know. The manufacturers of the lenses use this relation to design the lens of a … A lens has two curved surfaces, but both are not exactly same. MEDIUM. Click hereto get an answer to your question ️ Derive lens maker's formula for a biconvex lens. Lens Maker’s formula is a formula that relates focal length, radii of curvature, and refractive index of the lens. [Since it is a biconvex lens, f is positive, R 1 is positive and R 2 is negative. Starting with an expression for refraction at a single spherical surface, obtain Lens Maker's Formula. This is lens maker’s formula. A number of idealizations, simplifications and approximations are used to (a) 0.667 (b) 1.5 (c) 0.5 (d) zero (e) data insufficient. We assume a thin, converging lens and that the light rays we are dealing with are close to the principal axis and make very small angles with the principal axis ( angles of less than 10 o), resulting in very small angles of incidence. Derivation of Lensmaker’s formula. You may substitute the same values for the focal length in air and the radii of curvature of the faces in the l ens maker’s equation and satisfy yourself that the refractive index of the lens is 1.5. The formula giving the relation between the focal length (f) of the lens, the refractive index of the material of the lens (n) and the radii of curvature of its surface (R 1 & R 2) is known as Lens maker formula.. So, focal length of a lens increases when it is immersed in water. Combination of Thin Lenses. By using the lens maker’s formula you can determine the focal length of the specific lens if you know the parameters such as refractive index and radius of curvature. Lensmaker’s Formula by C. Bond Lenses with the same shape and index of refraction will have the same focal length. The magnification of an object placed in front of a convex lens … Here µ is refractive index of lens material to the medium outside. For a thin lens, the power is approximately the sum of the surface powers.. Lens-Maker's Formula. The lens maker formula is utilized to create a lens with a defined focal length. Prerequisites the lensmaker’s formula relates the index of refraction, the radii of curvature of the two surfaces of the lens, and the focal length of the lens. Also, put the numerical values of R 1 and R 2 equal to f]. The radius R 2 is negative since it extends left from the second surface. As different devices need lenses of different focal lengths, this formula helps lens manufacturers in finding the radii of curvature. 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